no oil pressure

This message is a reply to an archived post by Josh Cartey on July 05, 2012 at 14:42:05.The original subject was "no oil pressure".

I have now drained the oil and changed it. There was a lot of sludge in the bottom of the crankcase. I cleaned it all out and refilled with new oil. Started the tractor up for a min and it started to knock. Shut it down immediately. So now it"s getting no oil. Any ideas?

Josh, when I bought my 50 A it had no oil pressure. I checked the coupler and it was still intact. I found someone overtightened the oil filter cover nut breaking the oil pressure regulator housing that is located on top of the filter canister. If this is your problem it can be fixed without tearing to much of the tractor up. It's not a fun job. You"ll have to locate a replacement oil pressure regulator and probably a new stud. Check to see if you can remove the filter cover, if it just spins that"s a good indication the oil pressure regulator has been broken. Good luck. Fred

I went back and read your original post from July, and you were not getting any pressure then. Did you do anything to determine why it is not pumping? Or did you just change the oi, and hope that the tractor elves would stop by and fix it? Sorry to be cute, but what have you done since July to solve the oiling problem? Running, even for a minute, with no pressure, which you know you don't currently and did not have back in July, is just making a parts tractor for some one else.

It's time to take these many good suggestions, and rule out problems systematically. First, DON'T RUN THE ENGINE UNTIL YOU GET IT TO OIL! Next, remove the cover over the crankshaft so that you can see that the oil pump drive coupler is intact and that the oil pump shaft turns when you rotate the engine. Next, verify with air pressure or some other engine, that the gauge you have does indicate correctly. Turn off the gas, ground the plug wires so you don't start a fire, and remove the plugs so you can spin it over pretty fast. If it the pump drive is turning, if it is filled with oil, if the filter canister is not cracked so as to allow oil to vent out of the top of the canister without getting to the lines, if the screen is not clogged beyond imagination, oil should pump even when turning over by hand/starter.

Now...did you have the pressure adjusting spring/reed apart? Make sure is it intact and correctly assembled, but don't run it anymore until you get it to oil. That's one of the simplest little regulated pump systems you can find. It can only go wrong in a few places.

Ok here is the full story. I have had the tractor for eight years. I have ran it those eight years many of times at parades and tractor shows. It had an old oil pressure gauge on it that didn't work. I assume it was getting oil and had oil pressure those eight years because its never had any problems. I bought new gauges for it back in July. When I got those installed I noticed the oil pressure gauge said nothing. I quit working on it till now. Yesterday I decided to change the oil and filter cause it had never been done. It had lots of sludge in the bottom of crankcase. I cleaned it out and refilled with oil and new filter. I started it up and after running for a minute it started knocking. Shut it down immediately. I know that changing the oil and filter should not make it stop getting oil but it must of been getting oil previously since in never knocked before. That's where I'm at now.

Now how did you get sludge out????? And did you use john deere oil filter?????now if you didnt use john deerer oil filter get one, and take oil line off turn engine by hand until oil comes out line.something is just not adding up, also you should never run a tractor without oil gauge, aftermarket oil gauges never read correctly either always way lower than the real ones.

First, DON'T RUN THE ENGINE UNTIL YOU GET IT TO OIL! Next, remove the cover over the crankshaft so that you can see that the oil pump drive coupler is intact and that the oil pump shaft turns when you rotate the engine. Next, verify with air pressure or some other engine, that the gauge you have does indicate correctly. Turn off the gas, ground the plug wires so you don't start a fire, and remove the plugs so you can spin it over pretty fast. If it the pump drive is turning, if it is filled with oil, if the filter canister is not cracked so as to allow oil to vent out of the top of the canister without getting to the lines, if the screen is not clogged beyond imagination, oil should pump even when turning over by hand/starter. Now...did you have the pressure adjusting spring/reed apart? Make sure is it intact and correctly assembled, but don't run it anymore until you get it to oil. That's one of the simplest little regulated pump systems you can find. It can only go wrong in a few places.

I have looked at it and it appears to be a broken coupler. Looks to be cracked looking through the crankcase cover. Bout to tear it apart to fix. Thanks for the help everyone! It's been quite a few years since I worked on one. Just needed a little refreshing.

Josh, depending on the temperature, it could have broken because excessive water in the oil. Ice can break those couplers which act as sort of a "fuse" so that you don't do other damage. Check for water/ice in that pump when you drain it.

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